This article will show you how you can validate duplicate email id present in an sql table using c# in asp.net. In this we have shown using registration form.
Some of my previous articles are as follows: Add,
Remove, Validate CSS Class Applied To a HTML Control In Asp.Net Using jQuery.,
Confirm
Message Box With Ok and Cancel Detect On Button Click Using JavaScript In HTML
and Asp.net, Alert
Message On Button Click Using JavaScript In HTML, jQuery
DatePicker Calendar With Slide Effect on TextBox Click In Asp.Net.
First we will create a new new table in sql DB.
Query to create table.
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[UserTable](
[Id] [int] NULL,
[EmailId] [varchar](50) NULL,
[Name] [varchar](50) NULL,
[Password] [varchar](50) NULL,
[ContactNo] [varchar](50) NULL
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
|
So for this article first we will create a new asp.net
application and add the below code into your asp.net page.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1"
%>
<!DOCTYPE html
PUBLIC "-//W3C//DTD
XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Validation
of Duplicate Email Id Of Registration Form Using C# in Asp..Net </title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<table width="100%" cellpadding="4" cellspacing="4">
<tr>
<td align="right" class="style1" colspan="2" style="text-align: center">
<strong>REGISTRATION
FORM</strong>
</td>
</tr>
<tr>
<td align="right">
Email Id :
</td>
<td align="left">
<asp:TextBox ID="txtemail" runat="server" title="Enter your email id"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txtemail"
ErrorMessage="*"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
runat="server"
ControlToValidate="txtemail"
ErrorMessage="*" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td align="right">
Password :
</td>
<td align="left">
<asp:TextBox ID="txtpassword" runat="server" title="Enter your password"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="txtpassword"
ErrorMessage="*"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="right">
Confirm Password :
</td>
<td align="left">
<asp:TextBox ID="txtconfpassword" runat="server"
title="Enter
confirm password"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
ControlToValidate="txtconfpassword"
ErrorMessage="*"></asp:RequiredFieldValidator>
<asp:CompareValidator ID="CompareValidator1" runat="server"
ControlToCompare="txtpassword"
ControlToValidate="txtconfpassword" ErrorMessage="*"></asp:CompareValidator>
</td>
</tr>
<tr>
<td align="right">
Name :
</td>
<td align="left">
<asp:TextBox ID="txtname" runat="server" title="Enter your name"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
ControlToValidate="txtname"
ErrorMessage="*"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="right">
Contact No :
</td>
<td align="left">
<asp:TextBox ID="txtcontact" runat="server" title="Enter your contact no"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
ControlToValidate="txtcontact"
ErrorMessage="*"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="right">
</td>
<td align="left">
<asp:Label ID="lblmessage" runat="server" Style="color: #FF6666; font-weight: 700;"></asp:Label>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<asp:Button ID="btnsubmit" runat="server" Text="Submit" OnClick="btnsubmit_Click" />
</td>
</tr>
</table>
</form>
</body>
</html>
|
Now generate the button click event and add the below code
into the button click.
using System;
using System.Data.SqlClient;
using System.Data;
namespace WebApplication1
{
public partial class WebForm1 : System.Web.UI.Page
{
protected
void Page_Load(object
sender, EventArgs e)
{
}
protected
void btnsubmit_Click(object
sender, EventArgs e)
{
/* In
this you just make the email id unik field
* so when you add duplicate
email id it will give
* exception
*/
try
{
SqlConnection
con = new SqlConnection("Data Source=PC\\SQLEXPRESS;Initial
Catalog=Demo;Integrated Security=True");
string
queryValidate = "Select * from UserTable
where EmailId='" + txtemail.Text + "'";
DataTable
objdt = new DataTable();
SqlDataAdapter
da = new SqlDataAdapter(queryValidate,
con);
da.Fill(objdt);
if
(objdt.Rows.Count > 0)
{
lblmessage.Text = "Email Id Already Exists.";
}
else
{
string
query = "Insert into
UserMaster(EmailId,Password,Name,ContactNo) values('" +
txtemail.Text + "','" +
txtpassword.Text + "','" +
txtname.Text + "','" +
txtcontact.Text + "');";
SqlDataAdapter
saveda = new SqlDataAdapter(query,
con);
saveda.SelectCommand.ExecuteNonQuery();
lblmessage.Text = "User data saved successfully.";
}
}
catch
(Exception ex)
{
//Your
error message
}
}
}
}
|
In above code I have used select query to check weather the
email id present in sql table or not. If we found any record after eecuting the
query on that case email id exists in table.
Now run the application and check the output.
About the Author
Thank You. This is amazing and helpful for me.
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